Anorganisch‐katalytische Umsetzungen von Cyanamid und dessen Metaboliten in Quarzsand I. Mechanismus des Cyanamidabbaues unter dem Einfluß von Eisenoxiden und Feuchtigkeit

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Abstract
Inorganic catalytical transformation of cyanamide and its metabolites in quartz sand I. Mechanism of cyanamide breakdown as influenced by iron oxides and moistureA study was made of the inorganically catalysed breakdown of cyanamide by iron oxides in quartz sand, and the formation of metabolites in relation to the type of iron oxide and the moisture level in the system. The possibility that cyanamide breakdown was biological and enzymic was largely eliminated. In the absence of iron oxides the added cyanamide was practically unchanged over the 100 days of the experiment. With the addition of iron oxides such as amorphous Fe(III)‐hydroxide, ochre or rust, the cyanamide rapidly took up water after a few hours and urea was formed. Water uptake was dependent on the type of iron oxide added. When the moisture level in the reaction medium was low (5% of the total water capacity) the process was accelerated. Different amounts of dicyanamide and guanylurea were produced depending on the iron oxides applied. When the water content was high, reactions leading to the production of these compounds were slowed down. The inorganically catalysed breakdown of cyanamide depends on reaction conditions. It can result either in the uptake of water to produce urea directly or in the production of dicyanamide which gives rise to guanylurea by the further addition of water.

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